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This can also be paired with Earthen Vessel to get several darkness energies into your discard straightaway that you can then later accelerate onto your Pokemon using a combo of Sadas Vitality and Dark Patch With plenty of darkness energies in your discard pile, its time to start accelerating them onto your Roaring Moons

Its sacrificed anyway and put into its owners graveyard without it being destroyed

The best of the bunch even have energy-manipulating abilities for increased viability

That's a powerful way to ramp up your mana base with some mana-producing artifacts, or you could just have two Darksteel Colossuses bouncing around